Harked article and process of harking articles



Patented Sept. 20, 192

UNIT D-STAT PATENT OFFICE.

JOHN DOUGLASS GRANGE, OF I BROOKFIELD, ILLINOIS. ASSIGNOR 'IO WESTERN'IRIG COMPANY, INOORPOBATEROF NEW YORK, N. Y., A CORPORATION OF NEWYORK.

No Drawing.

This application relates to'marked articles and a process of markingarticles, more particularly to a process of marking articles havin achemically active surface. Tracings rom which blueprints are rinted areusually made on cloth which has een coated with a solution of starch toform a trans arent sheet, generally known as tracing 0 0th. In someinstances certain portions of drawings, such as borders, titles,standard notes and the like may be repeated on a reat many drawings. Insuch cases it is esirable and economical to print these items upon thetracing cloth by means of a stamp, or otherwise, mstead of outliningthem in the usual manner with pen and ink. However, the printing with astamp, using an ordinary ink, does not produce permanent markings, sincein that case p the ink does not penetrate into the sheet to anappreciable extent, as in the case where the pen is used, since the penforces the ink materially into the sheet. I

An ob ect of the present invention is to mark a chemically activesurface by applying thereto a substance which wlll react therewith. Y

The invention is based upon. the property of certain chemical elementsor compounds to react with certain others to pro uce or liberate acolored substance which may be used to produce markings upon a surface.In accordance with one embodiment of the .invention, a substancecontaining iodine may be applied to a surface containmg a carbo hydrate,iodine with the starch producing a permanent marking which isincorporated with the surface material. 40 The following formularepresents a composition which may be use upona starch covered tracincloth to produce markings by means of t e above mentioned reaction.

- Percentage by weight.

' Grade.

se s

' "d'd'di.

In preparing the composition the potas sium iodide is dissolved inwarm=water and but such as starch, the reactlon of the ing in aApplication filed August 81-, 1928, Serial 1\o.'660,4'=$fl.'l.

the iodine is added. The phenol is added when the iodine is nearlydissolved,considerable stirrin being required to( obtain a saturated soution.- The fluid is :then decanted or separated from any undissolvediodine and is read for use.

When such a so ution is used for stampmg characters or producing othermarkings upon a surface containing starch, as in the case of ordinarytracing cloth, it may be applied to the surface b means of an ordinaryrubber stamp an the iodine reacts with the starch of the tracing clothin the well known manner to produce colored markings. Although thisreaction when complete usually produces a blue-black mar ing, in somecases the resulting marklugs are of a deep reddish brown, owing to a ackof sufficient moisture to'complete the reaction, or to other causes.However, such a color is substantially as resistive as black to thelightused in printing on a sensitized surface in producing blueprints.The he- 1101 in the above descrlbed com osltion tends to makethe markingproduce by the reaction of the iodine with the starch in the tracingcloth darker in color and more permanent in character and also has the 4additional property of maintaining stamp pads which are treated with thecomposition moist.

This is in no sense a surface ink, the color being produced by thereaction of the active materlal applied to a surface with the activematerial of the surface, and in practice it is found to penetrate intothe very cloth itself. a

It is. apparent that the scope of the invention is not restricted to theparticular use herein set forth, but may be used wherever it is desiredto roduce permanent markings upon a chemlca ly active surface.

What is clalmed 1s:

1. A process of marking articles consisting in stamping iodine insolution upon a dry surface containing starch to produce a;

predetermined design thereon. 2. A'process of marking plying iodinedissolved in potasarticles consistsium iodide to a stamp andtransferring the iodine from the stamp to a dry surface containingcarbohydrate capable of ,reacting wlth iodine .to form a coloredsubstance to produce a predetermined design a predetermined design bythe reaction of by the reaction of the iodine and the cerbothe iodineand the starch. hydrate. Q In witness whereof I hereunto subscribe 8. Aprocess of marking articles, consiet-, my name this 22nd day of August,A. 1)., 5 ing in applying a solution of iodine in po- 1928.

tessium iodide and phenol to e dry surface, eeid surface containingstarch,- to produce JQHN DOUGLASS GRANGE.

